<div class="refentry"><a id="glUniformBlockBinding"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glUniformBlockBinding — assign a binding point to an active uniform block</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table class="funcprototype-table" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glUniformBlockBinding</strong>(</code></td><td>GLuint <var class="pdparam">program</var>, </td></tr><tr><td> </td><td>GLuint <var class="pdparam">uniformBlockIndex</var>, </td></tr><tr><td> </td><td>GLuint <var class="pdparam">uniformBlockBinding</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>program</code></em></span></dt><dd><p>
                    The name of a program object containing the active uniform block whose binding to assign.
                </p></dd><dt><span class="term"><em class="parameter"><code>uniformBlockIndex</code></em></span></dt><dd><p>
                    The index of the active uniform block within <em class="parameter"><code>program</code></em> whose binding to assign.
                </p></dd><dt><span class="term"><em class="parameter"><code>uniformBlockBinding</code></em></span></dt><dd><p>
                    Specifies the binding point to which to bind the uniform block with index <em class="parameter"><code>uniformBlockIndex</code></em> within <em class="parameter"><code>program</code></em>.
                </p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
            Binding points for active uniform blocks are assigned using <code class="function">glUniformBlockBinding</code>. Each of a program's active uniform
            blocks has a corresponding uniform buffer binding point. <em class="parameter"><code>program</code></em> is the name of a program object for which the command
            <a class="citerefentry" href="glLinkProgram"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a> has been issued in the past.
        </p><p>
            If successful, <code class="function">glUniformBlockBinding</code> specifies that <em class="parameter"><code>program</code></em> will use the data store of the
            buffer object bound to the binding point <em class="parameter"><code>uniformBlockBinding</code></em> to extract the values of the uniforms in the
            uniform block identified by <em class="parameter"><code>uniformBlockIndex</code></em>.
        </p><p>
            When a program object is linked or re-linked, the uniform buffer object binding point assigned to each of its active uniform blocks is reset to zero.
        </p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>uniformBlockIndex</code></em> is not an active uniform block index of <em class="parameter"><code>program</code></em>.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>uniformBlockBinding</code></em> is greater than or equal to the value of <code class="constant">GL_MAX_UNIFORM_BUFFER_BINDINGS</code>.
        </p><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated <em class="parameter"><code>program</code></em> is not the name of a program object generated by the GL.
        </p></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>
            <code class="function">glUniformBlockBinding</code> is available only if the GL version is 3.1 or greater.
        </p></div><div class="refsect1"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
            <a class="citerefentry" href="glGetActiveUniformBlock"><span class="citerefentry"><span class="refentrytitle">glGetActiveUniformBlock</span></span></a> with argument <code class="constant">GL_UNIFORM_BLOCK_BINDING</code>
        </p></div>
        {$pipelinestall}{$examples}
        <div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
            <a class="citerefentry" href="glLinkProgram"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a>,
            <a class="citerefentry" href="glBindBufferBase"><span class="citerefentry"><span class="refentrytitle">glBindBufferBase</span></span></a>,
            <a class="citerefentry" href="glBindBufferRange"><span class="citerefentry"><span class="refentrytitle">glBindBufferRange</span></span></a>,
            <a class="citerefentry" href="glGetActiveUniformBlock"><span class="citerefentry"><span class="refentrytitle">glGetActiveUniformBlock</span></span></a>
        </p></div><div class="refsect1"><div id="Copyright"><h2>Copyright</h2><p>
            Copyright © 2010 Khronos Group.
            This material may be distributed subject to the terms and conditions set forth in
            the Open Publication License, v 1.0, 8 June 1999.
            <a class="ulink" href="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.
        </p></div></div></div>
